more markdown link errors, hopefully this is the last edit
Arun Debray
]]>fixing markdown mistake
Arun Debray
]]>added two applications of spinh structures in physics
Arun Debray
]]>added a bunch of redirects and linked to this entry from related entries
]]>added more hyperlinks to technical terms, such as in the first lines to Spin^c group and Spin group
]]>Created.
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